Fractions that have the same denominator

$\frac35 + \frac15$

$\frac35 + \frac15$

To add (or subtract) fractions that have the same denominator, add (or subtract) their numerators and write the sum (or difference) over the common denominator and simplify the result, if possible.

$\frac18 + \frac58$

$\frac18 + \frac58$

$\frac{11}{15} - \frac{4}{15}$

$\frac{11}{15} - \frac{4}{15}$

$-\frac73 - \left(-\frac23\right)$

$-\frac73 - \left(-\frac23\right)$

$\frac{18}{25} - \frac{2}{25} - \frac{1}{25}$

$\frac{18}{25} - \frac{2}{25} - \frac{1}{25}$